Boiler



Oct. 9, 1934. I HARTER 1,975,789

,BOILER I Filed July 22, 1929 2 Sheets-Sheet 1 Fig. 1.

INVENTOR vaaam I ATI ORNEY5.

Patented Oct. 9, 1934 omTEDi 75513 .res

j BOILER Isaac Hatter, New York, N. Y.,- assignor to The I Babcock & Wilcox Company, Bayonne, N. J., a corporation of New Je'rsey Application July 22, 1929, Serial No. 380,172 Claims, v(o1. 122-265) This invention relates to a novel and improved form of boiler, the novel features of which will be best understood from'the following description and the annexed drawings, in which I have 5 shown a selected embodiment of the invention and in which;

Fig. 1 is a vertical sectional View through 'a boiler having my invention embodied therein.

Fig. 2 is a view taken on the line 2--2 of Fig. 1.

Fig. 3 is a section on the line 3-3 of Fig. 1.

Figs. 4 and 5 are sectional details on lines 44 and 55 of Fig. 3.

Referring first to Fig. 1, the invention is shown as embodied in a boiler disposed above a combustion chamber 1, in the Walls of which are water tubes 2 connected to the circulating system of the boiler, this particular furnace being heated by means of pulverized fuel, and part of one burner being shown at 3. Above the furnace 'is placed a plurality of tubes 4 preferably curved on the arcs of concentric circles and connected at their ends to headers 5 and 6, it being noted that the tubes enter the headers substantially normal thereto. Above the tubes 4 is shown a 2 5 superheater '7. The downtake headers 6 are connected to a steam and water drum 8 by means of nipples 9, while nipples 10 connect the steam drum to the uptake headers 5.

that the headers 5 and 6 form between them a tapered gas pass, through which gases flow over the tubes and the superheater to the gas outlet 11.

Referring now to Figs. 2 and 3, it will be seen that the boiler is formed of a plurality of sec- 'tions placed side by side, each section including an uptake and a downtake header connected by a single row of tubes extending lengthwise of the headers. The headers are relatively narrow rectangular shaped boxes placed side by side and closely adjacent each other, so as to define the opposite sides of the gas pass and the single row of tubes having their ends received in holes disposed substantially centrallyof the flat walls of the headers which face the pass. These walls are plain and, when headers having circular cross section are used, the Walls of the headers constituting the tube seat faces are rounded. The illustrative headers of rectangular cross section, of course, have flat faces, but it is to be appreciated that the invention is of such a scope that it covers fluid heat exchange apparatus in which the header portions forming the tube seat faces are rounded. In either case, the headers may be described as having plain sides when they do not have forged or upset portions so that adjafor indicated at 13, and by means of which ac- It will be seen cent tube seat faceswill be at an angle to each. other. The lower tubes 4' which with the others are curved lengthwise of the headers, have their axes disposed substantially in the plane passing through the axes of the two headers in the section, whereas the tubes 4 are swung on their ends so that the major portions of the tubes are disposed some on one side and some on the other side of such a plane, thus giving the staggered efiect which will be apparent from Fig. 2.

The amount of the swinging is preferably such that the approximate quarter points 12 of any one tube are disposed substantially midway between the tubes in an adjacent row extending transversely of the boiler. This gives a staggered effect while permitting the use of relatively narrow boxes as headers. These boxes may be provided with the usual handholes and fittings therecess to the tubes may be had.

The holes in a header within which the tube ends are received, are preferably bored normally to the surface of the header, but With sufiicient clearance so that thetubes may be swung in the holes to their desired positions. The tube ends may then be expanded into the holes invthe usual way.

1. In a water tube boiler, two groups of headers inclined to each other, the headers in each group being placed side by side and having substantially plain sides facing the headers in the other group, a single row of tube holes extending lengthwise of each header, and a row of curved tubes having their opposite ends secured in holes in opposite headers, the adjacent tubes connected to the same header having their planes of curvature oblique to each other to produce a tube bank in which the tubes are in staggered arrangement.

2. In a water tube steam boiler, a furnace, a steam and water drum, headers mounted in divergent relationship, and a bank of curved water tubes extending transversely of a gas pass leading from-the furnace and connected to the 10 0 headers and indirectly to the drum to form a natural circulation boiler, the curved tubes most gas pass with the headers therein extending in in position in their seats in opposite directions" to thereby throw the latter into staggered rela-'- tion with respect to each other.

4:. In a Water tube boiler, two groups ers, each group disposed on one side of a tapered the direction of gas flow, the headers in. each group having their sides facing the gaspass parallel to their longitudinal axes and having plane faces provided with tube seats, tubes connected to' headers in opposite groups and extending across the pass, said tubes being arranged rows transversely of the pass and having their ends received in holes arranged in rows extend of head-i ing lengthwise of the pass, each tube being bent and arranged with its convex side toward the inlet end of the pass, the adjacent tubes connected to the same header having their planes of curvature oblique to each other to produce a tube bank in which the tubes are in staggered arrangement, the tube seats in an individual header having parallel axes.

5. In a Water tube boiler, upwardly convergent header constructions disposed on opposite sides .of a tapered gas pass and extending in the direction of gas flow, the headers having plane i'faced sides facing the gas pass and provided with tube seats, tubes connected to the headers and extending across the pass, said tubes being arranged in rows transversely of the pass and having their ends received in tube seats arranged 'in rows extending lengthwise of the pass, each tube being bent and arranged with its convex side towards the inlet end of the pass, the adjacent tubes connected to the same header having their planes of curvature oblique to each other to produce a tube bank in which the tubes are in staggered arrangement.

' ISAAC HARTER. 

